Refractories for the outer verticals of coke ovens

Conclusions The mechanism of the destruction of dinas in the structure of the outer verticals of coke ovens was examined during the cooling of the structure deep down and during reversible low-temperature inversions in the silica modifications.Destruction of the dinas in the structure of the outer verticals is caused by its low spalling (thermal-shock) resistance because of the reversible low-temperature changes of the silica, and also the action of moisture brought in with the carbon batch. The moisture migrates into the cooler sections of the structure, and the steam resulting from this weakens the structure of the dinas.An increase in the service life of the dinas in the outer verticals is possible not only as a result of the use of articles with a high spalling resistance but with the use of unfired carbon batches.In laboratory and industrial conditions we established means of improving the spalling resistance of the dinas by adding fireclay together with lime-iron slip.The deformation properties of the dinas with the additives (fireclay) are preserved at a high enough level permitting its use in the outer verticals of coke ovens.It is necessary to prepare an experimental industrial batch of dinas using the new method in order to carry out service tests. During industrial tests we should ensure a reduction in the moisture content of the carbon batches employed.Translated from Ogneupory, No. 6, pp. 14–19, June, 1982.